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Unformatted text preview: The Physics of Light & Sound Introduction In this experiment you will measure several sound levels and will investigate how they can be added together. The sound level is related to the intensity of the sound, which is proportional to the energy of the sound wave. Keep in mind that the human perception of sound strength (loudness) is different than the sound level. Formulae Intensity, I , is deFned as power per unit area: I = Power Area = P A (1) The SI unit for intensity is W/m 2 . Because audible sounds range in intensity from 10-12 W/m 2 to 1 W/ m 2 (several orders of magnitude) it is more convenient to use a logarithmic scale for measuring sound levels. This scale is called the decibel scale and the sound intensity level (SIL) is deFned as: SIL =10Log I I (2) where I = 10-12 W/m 2 . Equipment/Materials: or this experiment you will need a sound level meter and different sources of sound. The sound level meter has a microphone, an internal ampliFer, and a meter. There are 3 switches you will need to use:meter has a microphone, an internal ampliFer, and a meter....
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- Spring '08